How To Repair Wet or Leaking Concrete Cracks

How you repair a concrete crack is dependent on where the crack is located and on the condition of the crack. Using the wrong crack repair solution could result in the crack re-forming, or in new cracks forming.

For cracks that are wet or actively letting in water, you want to use a hydrophobic polyurethane repair kit. Hydrophobic simply means “water activated.” Hydrophobic kits will react with the water and transform into a foam that expands up to 40 times. The foam will fill in the crack from the back of the crack to the front, instantly stopping water and keeping it out 10 years down the road.

Hydrophobic Repair Kits

Hydrophobic Concrete Repair Kits and how to use them.

Preparation

Clean out the crack. Make sure the crack is free of loose materials. If the crack has been previously repaired, remove repair materials completely.

Application

1. For hairline cracks, insert injection ports into the concrete every 6-12 inches. For larger cracks, insert injection ports into the concrete every 12 inches. Ports should be injected at a 45 degree angle into the center of the crack. In some cases, the injection ports can be injected directly in through the face of the crack.

2. Using water, test that the injection ports were properly inserted and that the crack is accepting water through the ports.

3. Mix the polyurethane solution and accelerator into the injection gun and screw the lid on.

4. Attach the injection gun to the ports and pump the material into the crack through the ports. Start at the first, or bottom, port first.

5. Move up/down the crack until the crack has been repaired.6. Wipe away any extra materials and let dry.

Dry Time

Let dry 24 hours. Reaction is immediate, water will stop on contact.

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Learn more about Foundation Armor’s professional grade line of concrete sealers, concrete coatings, concrete cleaners and concrete repair products by visiting FoundationArmor.com or by calling 866-306-0246.